Despite the massive swing in value on the Binance US exchange, Bitcoin’s value on other exchanges remained stable. There has been speculation on the exact cause of the spike, though Binance offered a short statement to Bloomberg explaining that one of its institutional traders was responsible.
In order to provide a methodology to detect bubbles in time series, Phillips, Wu, and Yu [23] proposed the supremum augmented Dickey-Fuller (SADF) test. This applies a series of right-tailed unit root tests to expanding windows of a time series (with a fixed start date), defined by where r2 is the final data point to be considered in each window, starting at r0 which is a fraction representing the smallest allowed window size and expanding to 1(the complete data set).

Another institutional hit for bitcoin–which probably had the most sustained effect–was the SEC’s refusal to approve a bitcoin exchange-traded fund (ETF). This would be a path for more mainstream people in finance to dabble with blockchain; it would allow investors to dip their toes in bitcoin without owning the actual asset. Not only that, but it would make bitcoin available on the most prominent financial markets. The U.S. Securities and Exchange Commission (SEC), however, has yet to allow such a fund to exist–mostly because it is unable to monitor crypto-transactions in order to avoid market manipulation.
SafeMoon technically isn't a cryptocurrency but a DeFi token, according to its website.